From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 071311DF24A; Wed, 6 Nov 2024 12:09:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730894954; cv=none; b=WV+myIyEwewWMxVfGCxSzurIkWTkPM5C+6PvzDM3hL/TIzfWy93JjGcEqk5A+41uUlFpwv+Wy2CYUwy22anhYJpA9T/x/zYjYELxzUcZXBJCKHlXfNytgqMGrT/FDljAPVigkb09d/NE2QhdzyYbZYZlnp0DE7BDQNJM42Gv+Lo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730894954; c=relaxed/simple; bh=1UxanRS6MNvtkAMuNAVLN0h9JymPRJHNpUZ7tY2zyes=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IJ+0eJatttYsnt/gtl2kYiAjKmihBSGL2NlLRNcWxcHIa8Gg6tgYu3JLWgdBC9m5JfpsZsWAgP9hpw186L0GHPvDM5z+90soldFibSnZPGcuOtjWZjF94mmsU4hgwwI0HZM8N9CCNzki/piDuwyveB2oDXjMbTkbOluZCVJ51dA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oExsEJtK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oExsEJtK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EFDDC4CECD; Wed, 6 Nov 2024 12:09:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730894953; bh=1UxanRS6MNvtkAMuNAVLN0h9JymPRJHNpUZ7tY2zyes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oExsEJtK+ucbOHskxV+QGLmpYWlIsMTA7ASnDf2v4dE/B1+d+t40T8W/XdLvUhll7 EL1s/kKWraDqISagBHwh51OHDVeJt0JCheyrm+BjaZXs+EZMBmeSbWPJcOViKUNw1Z b81cAhFvZ0GdKFDL+OX1zgepAn9BzHdQjZ7CgXfU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jacky Chou , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 018/350] net: ftgmac100: Ensure tx descriptor updates are visible Date: Wed, 6 Nov 2024 12:59:06 +0100 Message-ID: <20241106120321.322810509@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120320.865793091@linuxfoundation.org> References: <20241106120320.865793091@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jacky Chou [ Upstream commit 4186c8d9e6af57bab0687b299df10ebd47534a0a ] The driver must ensure TX descriptor updates are visible before updating TX pointer and TX clear pointer. This resolves TX hangs observed on AST2600 when running iperf3. Signed-off-by: Jacky Chou Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/faraday/ftgmac100.c | 26 ++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index 23c019d1278cd..f6ed8d167d53c 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -579,7 +579,7 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed) (*processed)++; return true; - drop: +drop: /* Clean rxdes0 (which resets own bit) */ rxdes->rxdes0 = cpu_to_le32(status & priv->rxdes0_edorr_mask); priv->rx_pointer = ftgmac100_next_rx_pointer(priv, pointer); @@ -663,6 +663,11 @@ static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv) ftgmac100_free_tx_packet(priv, pointer, skb, txdes, ctl_stat); txdes->txdes0 = cpu_to_le32(ctl_stat & priv->txdes0_edotr_mask); + /* Ensure the descriptor config is visible before setting the tx + * pointer. + */ + smp_wmb(); + priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv, pointer); return true; @@ -816,6 +821,11 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb, dma_wmb(); first->txdes0 = cpu_to_le32(f_ctl_stat); + /* Ensure the descriptor config is visible before setting the tx + * pointer. + */ + smp_wmb(); + /* Update next TX pointer */ priv->tx_pointer = pointer; @@ -836,7 +846,7 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb, return NETDEV_TX_OK; - dma_err: +dma_err: if (net_ratelimit()) netdev_err(netdev, "map tx fragment failed\n"); @@ -858,7 +868,7 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb, * last fragment, so we know ftgmac100_free_tx_packet() * hasn't freed the skb yet. */ - drop: +drop: /* Drop the packet */ dev_kfree_skb_any(skb); netdev->stats.tx_dropped++; @@ -1444,7 +1454,7 @@ static void ftgmac100_reset_task(struct work_struct *work) ftgmac100_init_all(priv, true); netdev_dbg(netdev, "Reset done !\n"); - bail: +bail: if (priv->mii_bus) mutex_unlock(&priv->mii_bus->mdio_lock); if (netdev->phydev) @@ -1515,15 +1525,15 @@ static int ftgmac100_open(struct net_device *netdev) return 0; - err_ncsi: +err_ncsi: napi_disable(&priv->napi); netif_stop_queue(netdev); - err_alloc: +err_alloc: ftgmac100_free_buffers(priv); free_irq(netdev->irq, netdev); - err_irq: +err_irq: netif_napi_del(&priv->napi); - err_hw: +err_hw: iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); ftgmac100_free_rings(priv); return err; -- 2.43.0